Spatial and temporal pattern monitoring on groundwater and surface water interactions using fiber-optic distributed temperature sensing

Research output: Contribution to conferencePaper

Abstract

Fiber-optic distributed temperature sensing (FO-DTS) was used to monitoring stream bed temperature patterns over 1 km to identify groundwater discharge zones of the Upper Sangamon River, as part of the Intensely Managed Landscapes Critical Zone Observatory. This ongoing study is designed to identify the spatial and temporal patterns of groundwater and surface water interactions. A 1-km fiber optic cable was installed on the river bed in the upstream of the Sangamon River. The cable, connected to an Oryx DTS device, was deployed in a duplexed single-ended configuration with 1 m spatial resolution and 1-hour interval time. The first test for recording temperature measurements on this project was completed over 14 days in summer 2017. The data collection was calibrated by ice and hot water baths in the first approximately 55 m of the cable. Temperature-Distance-Time (TDT) map of the river bed shows that temperature changed uniformly, and was associated with diurnal atmospheric temperature fluctuations. There was an obvious time-delay effect that between the atmospheric and riverbed temperatures that is controlled by thermal radiation. The downward-trending curve of riverbed temperatures is consistent with a decrease in average air temperature. But, measurements in a approximately 25 m downstream area show an abnormal 'double-delayed' offset in the TDT. These effects continued throughout the entire test period, and was not impacted by atmospheric or hydrologic dynamics. One possibility is that groundwater is discharging to the river bed in that area. To understand the thermal dynamics of groundwater discharge in various spatiotemporal scales, the ongoing research will incorporate the contributions from (1) changes in river velocity and depth over time, (2) local precipitation data, and (3) stratigraphic and lithologic changes across the river bed. Furthermore, a hydrological-thermal hybrid model, validated by FO-DTS measurements, could better represent the spatial and temporal variations so such interactions could be studied in different hydrologic settings.
Original languageEnglish (US)
PagesPaper-No. 28-15
DOIs
StatePublished - 2018
EventGSA North-Central 2018 Annual Meeting - Iowa State University, Ames, United States
Duration: Apr 16 2018Apr 17 2018
Conference number: 52

Conference

ConferenceGSA North-Central 2018 Annual Meeting
CountryUnited States
CityAmes
Period4/16/184/17/18

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fiber optics
surface water
groundwater
monitoring
river bed
temperature
cable
air temperature
river
stream bed
spatial resolution
temporal variation
spatial variation
observatory
ice
summer

Keywords

  • ISGS

Cite this

Spatial and temporal pattern monitoring on groundwater and surface water interactions using fiber-optic distributed temperature sensing. / Liu, Honglei; Lin, Yu-Feng Forrest; Stumpf, Andrew J.; Kumar, Praveen; Sargent, Steve.

2018. Paper-No. 28-15 Paper presented at GSA North-Central 2018 Annual Meeting, Ames, United States.

Research output: Contribution to conferencePaper

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abstract = "Fiber-optic distributed temperature sensing (FO-DTS) was used to monitoring stream bed temperature patterns over 1 km to identify groundwater discharge zones of the Upper Sangamon River, as part of the Intensely Managed Landscapes Critical Zone Observatory. This ongoing study is designed to identify the spatial and temporal patterns of groundwater and surface water interactions. A 1-km fiber optic cable was installed on the river bed in the upstream of the Sangamon River. The cable, connected to an Oryx DTS device, was deployed in a duplexed single-ended configuration with 1 m spatial resolution and 1-hour interval time. The first test for recording temperature measurements on this project was completed over 14 days in summer 2017. The data collection was calibrated by ice and hot water baths in the first approximately 55 m of the cable. Temperature-Distance-Time (TDT) map of the river bed shows that temperature changed uniformly, and was associated with diurnal atmospheric temperature fluctuations. There was an obvious time-delay effect that between the atmospheric and riverbed temperatures that is controlled by thermal radiation. The downward-trending curve of riverbed temperatures is consistent with a decrease in average air temperature. But, measurements in a approximately 25 m downstream area show an abnormal 'double-delayed' offset in the TDT. These effects continued throughout the entire test period, and was not impacted by atmospheric or hydrologic dynamics. One possibility is that groundwater is discharging to the river bed in that area. To understand the thermal dynamics of groundwater discharge in various spatiotemporal scales, the ongoing research will incorporate the contributions from (1) changes in river velocity and depth over time, (2) local precipitation data, and (3) stratigraphic and lithologic changes across the river bed. Furthermore, a hydrological-thermal hybrid model, validated by FO-DTS measurements, could better represent the spatial and temporal variations so such interactions could be studied in different hydrologic settings.",
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author = "Honglei Liu and Lin, {Yu-Feng Forrest} and Stumpf, {Andrew J.} and Praveen Kumar and Steve Sargent",
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AU - Stumpf, Andrew J.

AU - Kumar, Praveen

AU - Sargent, Steve

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N2 - Fiber-optic distributed temperature sensing (FO-DTS) was used to monitoring stream bed temperature patterns over 1 km to identify groundwater discharge zones of the Upper Sangamon River, as part of the Intensely Managed Landscapes Critical Zone Observatory. This ongoing study is designed to identify the spatial and temporal patterns of groundwater and surface water interactions. A 1-km fiber optic cable was installed on the river bed in the upstream of the Sangamon River. The cable, connected to an Oryx DTS device, was deployed in a duplexed single-ended configuration with 1 m spatial resolution and 1-hour interval time. The first test for recording temperature measurements on this project was completed over 14 days in summer 2017. The data collection was calibrated by ice and hot water baths in the first approximately 55 m of the cable. Temperature-Distance-Time (TDT) map of the river bed shows that temperature changed uniformly, and was associated with diurnal atmospheric temperature fluctuations. There was an obvious time-delay effect that between the atmospheric and riverbed temperatures that is controlled by thermal radiation. The downward-trending curve of riverbed temperatures is consistent with a decrease in average air temperature. But, measurements in a approximately 25 m downstream area show an abnormal 'double-delayed' offset in the TDT. These effects continued throughout the entire test period, and was not impacted by atmospheric or hydrologic dynamics. One possibility is that groundwater is discharging to the river bed in that area. To understand the thermal dynamics of groundwater discharge in various spatiotemporal scales, the ongoing research will incorporate the contributions from (1) changes in river velocity and depth over time, (2) local precipitation data, and (3) stratigraphic and lithologic changes across the river bed. Furthermore, a hydrological-thermal hybrid model, validated by FO-DTS measurements, could better represent the spatial and temporal variations so such interactions could be studied in different hydrologic settings.

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